A zip tie around the main stem, just under the branch that is worring you will prevent the branch from peeling off. If you have any rain, the buds on the branch will act like a sponge, adding water weight, then you will have real problems.

In most cases a split off branch can be put back from where she came from with no ill effects. Figure a way to take the weight off the split, then tie her up or zip tie her, or both. Be gentle and it should work.

The streetlight should not be a problem after you shoot it out. But that may not be such a bright idea...pun intended . Someone on a cherry picker will have to go up there, and from that perch he will be able to look into your back yard and see the girls. Not to mention he will be able to tell from what direction the shots came from.... So if you must take it out, hit it from the other side.